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glacial striations on basalt columns - devils postpile (california)

The top of the columns of Devils Postpile - Columnar Basalt in the Eastern Sierra (California)

A basalt volcanic flow formed hexagonal-shaped columns when it cooled down.­

You can clearly see the parallel grooves showing the erosion caused by debris pushed by the slow-moving ice of the glacier that used to cover this valley.­ Those marks are called glacial striations.­

For more info about this rock formation, go to en.­wikipedia.­org/­wiki/­Devils_­Postpile_­National_­Monument.

Inyo National Forest, Pacific Crest Trail, California, USA

Lava beds and geothermal features in the Pacific North-West.­

Photos taken in various locations of the Eastern Sierra region, in California.­